The design of the RCM cartridges were 2 fold. The first reason was a round that used the standard belted mag bolt face without alterations and having the same number of rounds in the magazine. The second reason was to near duplicate ballistics of extremely popular and effective rounds used in a short action for handiness and portability. The .300 and .338 Win Mags are extremely popular and effective on both NA and African plains game. The RCM rounds now duplicate these cartridges ballistics in a shorter, handier, rifle without losing any effectiveness. I for one have never seen the need for a belt around a cartridge and am glad some firearms makers now are recognizing this. The case capacities of both the .300 and .338 RCM are very close to case capacities of the .300 and .338 Win Mags, so standard powders can be used more efficiently due the larger ignition area exposed to the primer. This is where efficiency comes into play. One doesn't need the longer barrels to burn the powder effectively. There was also no necessity for a standard length case to increase velocity just to compete for highest velocity per bore. Existing rounds already cover this area of super velocity. The case capacity of the .375 RCM also is larger than the .375 H&H, so should have similar or better ballistics than it even with normal powder loads. I think the firearms industry has finally reached the stage where having a belt is not needed or wanted as similar ballistics can be achieved using shorter handier rifles with rounds not having the belt. I like the idea and you can bet you'll be seeing more of them over the next 5 years.